libmudflap/acinclude.m4

   1 dnl Check whether the target supports TLS.
   2 AC_DEFUN([LIBMUDFLAP_CHECK_TLS], [
   3   LIBMUDFLAP_ENABLE(tls, yes, [Use thread-local storage])
   4   AC_CACHE_CHECK([whether the target supports thread-local storage],
   5                  have_tls, [
   6     AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
   7       [dnl If the test case passed with dynamic linking, try again with
   8       dnl static linking.  This fails at least with some older Red Hat
   9       dnl releases.
  10       save_LDFLAGS="$LDFLAGS"
  11       LDFLAGS="-static $LDFLAGS"
  12       AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
  13                     [have_tls=yes], [have_tls=no], [])
  14       LDFLAGS="$save_LDFLAGS"],
  15       [have_tls=no],
  16       [AC_COMPILE_IFELSE([__thread int foo;], [have_tls=yes], [have_tls=no])]
  17     )])
  18   if test "$enable_tls $have_tls" = "yes yes"; then
  19     AC_DEFINE(HAVE_TLS, 1,
  20               [Define to 1 if the target supports thread-local storage.])
  21   fi])
  22
  23 dnl ----------------------------------------------------------------------
  24 dnl This whole bit snagged from libgfortran.
  25
  26 sinclude(../libtool.m4)
  27 dnl The lines below arrange for aclocal not to bring an installed
  28 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
  29 dnl add a definition of LIBTOOL to Makefile.in.
  30 ifelse(,,,[AC_SUBST(LIBTOOL)
  31 AC_DEFUN([AM_PROG_LIBTOOL])
  32 AC_DEFUN([AC_LIBTOOL_DLOPEN])
  33 AC_DEFUN([AC_PROG_LD])
  34 ])
  35
  36 dnl ----------------------------------------------------------------------
  37 dnl This whole bit snagged from libstdc++-v3.
  38
  39 dnl
  40 dnl LIBMUDFLAP_ENABLE
  41 dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
  42 dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
  43 dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
  44 dnl
  45 dnl See docs/html/17_intro/configury.html#enable for documentation.
  46 dnl
  47 m4_define([LIBMUDFLAP_ENABLE],[dnl
  48 m4_define([_g_switch],[--enable-$1])dnl
  49 m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
  50  AC_ARG_ENABLE($1,_g_help,
  51   m4_bmatch([$5],
  52    [^permit ],
  53      [[
  54       case "$enableval" in
  55        m4_bpatsubst([$5],[permit ])) ;;
  56        *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
  57           dnl Idea for future:  generate a URL pointing to
  58           dnl "onlinedocs/configopts.html#whatever"
  59       esac
  60      ]],
  61    [^$],
  62      [[
  63       case "$enableval" in
  64        yes|no) ;;
  65        *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
  66       esac
  67      ]],
  68    [[$5]]),
  69   [enable_]m4_bpatsubst([$1],-,_)[=][$2])
  70 m4_undefine([_g_switch])dnl
  71 m4_undefine([_g_help])dnl
  72 ])